Sure, gas prices are low now, but in the summer of 2008, when gas prices hit upwards of $4 a gallon, it scared a lot of drivers. Suddenly, green driving was all the rage and consumers tried eco-friendly driving. Some even switched to the most fuel-efficient car models they could find, and of course, they searched for as much hybrid car information as they could get their hands on, too.

Hybrid cars and trucks use an electric motor to power the car when the gasoline engine isn't necessary. That allows the internal combustion engine to shut off, saving gas. Because of those savings, hybrid cars have become increasingly popular. And hybrids aren't just for granola-crunching hippies anymore, either -- luxury car makers have gotten into the game.